20204040042 has 12 divisors (see below), whose sum is σ = 43775420130. Its totient is φ = 6734680008.

The previous prime is 20204040041. The next prime is 20204040047. The reversal of 20204040042 is 24004040202.

20204040042 is a `hidden beast` number, since 20 + 204 + 0 + 400 + 42 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12617804241 + 7586235801 = 112329^2 + 87099^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1122446669 = 20204040042 / (2 + 0 + 2 + 0 + 4 + 0 + 4 + 0 + 0 + 4 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 20204039997 and 20204040024.

It is not an unprimeable number, because it can be changed into a prime (20204040041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 561223317 + ... + 561223352.

Almost surely, 2^20204040042 is an apocalyptic number.

20204040042 is an abundant number, since it is smaller than the sum of its proper divisors (23571380088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20204040042 is a wasteful number, since it uses less digits than its factorization.

20204040042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122446677 (or 1122446674 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

Adding to 20204040042 its reverse (24004040202), we get a palindrome (44208080244).

The spelling of 20204040042 in words is "twenty billion, two hundred four million, forty thousand, forty-two".